CITATION: Bates, N.R., Best, M.H.P., and Hansell, D.A., 200. Dissolved inorganic carbon (DIC) data from Shelf-Basin Interactions (SBI) survey cruises in the Chukchi and Beaufort Seas collected in 2004 TITLE: Dissolved Inorganic Carbon (DIC) data from SBI cruises HLY0402 and HLY0403 AUTHOR: Dr N.R. Bates Bermuda Institute of Ocean Sciences (BIOS) 17 Biological Lane St George's GE01 Bermuda Tel: 1-441 297-1880 (x210) Fax: 1-441 297-8143 Nick.Bates@bbsr.edu http://www.bbsr.edu/Labs/co2lab/co2main.html DATA CONTACT: Dr N.R. Bates Bermuda Institute of Ocean Sciences (BIOS) 17 Biological Lane St George's GE01 Bermuda Tel: 1-441 297-1880 (x210) Fax: 1-441 297-8143 Nick.Bates@bbsr.edu http://www.bbsr.edu/Labs/co2lab/co2main.html FUNDING SOURCE AND GRANT NUMBER: NSF grant OPP-0124868 DATA SET OVERVIEW: Dissolved Inorganic Carbon (DIC) Data. „ HLY0402 are the data for the Spring cruise „ HLY0403 are the data for the Summer cruise Both cruises were in the Chukchi Sea and Beaufort Sea on board the USCGC Healy. Individual data point locations are identified with decimal latitude and longitude and depth (m). DATA COLLECTION AND PROCESSING: Physical, biogeochemical and biological measurements were made from the USCGC Healy during two cruises to the Chukchi and Beaufort Seas as part of the 2004 field phase of the Western Arctic SBI project. Three sections across the Chukchi and Beaufort Sea shelf, shelf-slope and Arctic basin were repeated each cruise, including: (1) West Hanna Shoal (WHS); (2) East Hanna Shoal (EHS) transect, and; (3) Barrow Canyon (BC) transect. In addition, during summer field activities, a fourth section East of Barrow (EB), and a section extending from the Alaskan side of the Bering Strait to the Diomede Islands also were taken. At each CTD/rosette station, a suite of biological and chemical measurements was collected, including salinity, inorganic nutrients (ammonium, nitrate, nitrite, phosphate, reactive silicon, and urea), dissolved inorganic carbon (DIC), dissolved oxygen and particulate organic matter (further details are given in Bates et al., 2005a, b). CTD, bottle and rate data are available at the SBI web site, and archived at the National Snow and Ice Data Center (NSIDC; http://nsidc.org/). Seawater samples for DIC were drawn from the Niskin samplers into pre-cleaned 300-ml borosilicate bottles. DIC samples were subsequently poisoned with HgCl2 to halt biological activity, sealed, and returned to BBSR for analysis. DIC samples were analyzed using a highly precise and accurate (~0.025%; ~0.5 µmol kg_1), gas extraction coulometric-detection system (Bates et al., 1996, 1998; Bates, 2001). The analytical system consists of a Single-Operator Multi-parameter Metabolic Analyzer (SOMMA) coupled to a CO2 coulometer (model 5011; UIC Coulometrics) and personal computer (Johnson et al., 1993). Routine analyses of Certifed Reference Materials (provided by A.G. Dickson, Scripps Institution of Oceanography) ensured that the accuracy of the DIC measurements was within 0.05% (~0.5 µmol kg_1). The SOMMA-coulometer system has been used at BIOS (or formerly the Bermuda Biological Station For Research) for 15 years to analyze DIC samples from the Bermuda Atlantic Time-series Study (BATS) site and to determine long-term trends in oceanic CO2 and airŠsea CO2 exchange in the subtropical gyre of the North Atlantic Ocean (Bates et al., 2002). The salinity of each DIC sample also was directly measured during analysis using a SeaBird SBE-911 conductivity sensor. The salinity data generated from the DIC analyses were compared with discrete salinity measurements made onboard the USCGC Healy as part of the quality control and assurance protocols. However, discrete salinity data from the USCGC Healy (Codispoti et al., 2005) were used here in data analysis and interpretation. DATA FORMAT: The two last columns of the data sets are DIC concentration and quality flag. Columns are: station, cast, bottle, depth, CTD salinity, salinity, SiO4 (µmoles kg-1), NO3 (µmoles kg-1), NO2 (µmoles kg-1), PO4 (µmoles kg-1), POM sample ID, POC (µg L-1), Quality flag, PON (µg L-1), Quality flag. -999 is used to denote no value. DATA REMARKS: Quality flags are 2= Good data; 5= Bad data?; 9= No sample REFERENCES: Bates, N.R., 2001. Interannual changes of oceanic CO2 and biogeochemical properties in the Western North Atlantic subtropical gyre. Deep-Sea Research II, 48(8-9), 1507-1528. Bates, N.R., Michaels, A.F., and Knap, A.H., 1996. Seasonal and interannual variability of the oceanic carbon dioxide system at the U.S. JGOFS Bermuda Atlantic Time-series Site. Deep-Sea Research II, 43(2-3), 347-383. Bates, N.R., Hansell, D.A., Carlson, C.A., and Gordon, L.I., 1998. Distribution of CO2 species, estimates of net community production and air-sea CO2 exchange in the Ross Sea polynya. Journal of Geophysical Research, 103(C2), 2883-2896. Bates, N.R., Best, M.-H.P., and Hansell, D.A., 2005. Spatio-temporal distribution of dissolved inorganic carbon and Net community production in the Chukchi and Beaufort Seas. Deep-Sea Research II, 52, 3303-3323. Bates, N.R., Moran, B., Hansell, D.A., Codispoti, L.A., and Swift, J.R., 2005. Seasonal and spatial distribution of suspended and large aggregate particulate organic matter (POM) in the Chukchi Sea. Deep-Sea Research II, 52, 3324-3323. Codispoti, L. Flagg, C., Kelly, V., 2005. Hydrographic conditions during the 2002 SBI process experiments. Deep-Sea Research II (December 2005 SBI special issue, in press).